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y = x² - 4x + 3
y=y
-x + 3 = x² - 4x + 3
-x² - x + 4x + 3 - 3 = 0
-x² + 3x + 0 = 0
x² + 3 x = 0
x(x +3) = 0
x = -3
y= -x + 3
y= 3 + 3
y = 6
(-3,6)